In the day's other match, South Korean striker Son Heung Min scored four goals as Tottenham produced a second half blitz to win 5-2 away to Southampton.
"We were the better side, that's for sure. We had lots of chances to score several goals in the first half, but it was still tight because Nice also had chances after our first two goals. But Keylor was exceptional," said PSG coach Thomas Tuchel.
"You just learn how to deal with the situations that you're in. Obviously I've been in immense pressure situations. I've had people on the pitch whistling in the stadium to me."
Ferreira, who replaced former Real Madrid midfielder Lucas Silva just after the hour mark, struck in the 92nd minute with a glancing header after an Alisson de Freitas corner.
Seven minutes later, Caio Lucas added his name to the scoresheet as Sharjah rounded off the scoring.
Wuhan once had a good chance to pull one back in the 43rd minute when midfielder Liu Yun sent an accurate cross in the penalty area, but forward Dong Xuesheng failed to touch the ball.
The UEFA Super Cup is an annual match between the reigning champions of the two European major football competitions, the UEFA Champions League and the UEFA Europa League.
Mainz were unable to put up resistance but were lucky enough that Forsberg rattled only the woodwork in the 31st minute and Angelino hit the side netting from tight angle before the half time.
BUCHAREST, Sept. 21 (Xinhua) -- Three Javelin throwers exceeded the meeting record at the Balkan Championships in Cluj-Napoca on Sunday, while Moldova's Andrian Mardare emerged victorious with 83.60m.
Saturday ends with Southampton facing a tricky visit to play Burnley. Southampton have lost both league games so far and were dumped out of the Carabao Cup by Brentford, while Burnley lost their only league game away to Leicester City, before bouncing back to beat Milwall in the Carabao Cup. They have a good record against Southampton with four wins and three draws against them since October 2016.
Zhou Junchen was brought down inside the box in the 54th minute. His teammate Romain Alessandrini then added the second goal for Huanghai by penalty.